@article{2f298f9dfdba44d4b527aa9a3344eff5,
title = "A nested case-control study of first-trimester maternal vitamin D status and risk for spontaneous preterm birth.",
author = "Baker, \{Arthur M\} and Sina Haeri and Camargo, \{Carlos A\} and Stuebe, \{Alison M\} and Boggess, \{Kim A\}",
note = "We assessed if first-trimester vitamin D deficiency is more prevalent in women who experienced a spontaneous preterm birth compared with women who delivered at term. We conducted a nested case-control study of pregnant women who had previously given blood for first-trimester combined screening for trisomy 21 and subsequently delivered at a tertiary hospital between November 2004 and July 2009.",
year = "2011",
month = apr,
day = "15",
doi = "10.1055/S-0031-1276731",
language = "American English",
volume = "28",
journal = "American Journal of Perinatology",
issn = "1098-8785",
publisher = "Thieme",
number = "9",
}